Index: cc/animation/timing_function.cc |
diff --git a/cc/animation/timing_function.cc b/cc/animation/timing_function.cc |
index 7fdb37fed962a48fa68a3e9b58252b694c50f4ca..3c6d4eb8cd3ffbd384d6a97a2c5a78e85d5f489d 100644 |
--- a/cc/animation/timing_function.cc |
+++ b/cc/animation/timing_function.cc |
@@ -162,4 +162,29 @@ scoped_ptr<TimingFunction> EaseInOutTimingFunction::Create() { |
0.42, 0.0, 0.58, 1).PassAs<TimingFunction>(); |
} |
+scoped_ptr<StepsTimingFunction> StepsTimingFunction::Create( |
+ int steps, bool stepsAtStart) { |
+ return make_scoped_ptr(new StepsTimingFunction(steps, stepsAtStart)); |
+} |
+ |
+StepsTimingFunction::StepsTimingFunction(int steps, |
+ bool stepsAtStart) |
+ : steps_(steps), stepsAtStart_(stepsAtStart) {} |
+ |
+StepsTimingFunction::~StepsTimingFunction() {} |
+ |
+float StepsTimingFunction::GetValue(double x) const { |
+ return std::min(1.0, (floor(steps_ * x) + stepsAtStart_) / steps_); |
+} |
+ |
+scoped_ptr<AnimationCurve> StepsTimingFunction::Clone() const { |
+ return make_scoped_ptr( |
+ new StepsTimingFunction(*this)).PassAs<AnimationCurve>(); |
+} |
+ |
+void StepsTimingFunction::Range(float* min, float* max) const { |
+ *min = static_cast<float>(stepsAtStart_) / static_cast<float>(steps_); |
+ *max = 1.0; |
+} |
+ |
} // namespace cc |